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Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish platina, a diminutive of plata "silver". [7] [8] Platinum is a member of the platinum group of elements and group 10 of the periodic table of ...
The coin had a face value of 100 Estonian kroons, a platinum purity of 999/1000, a weight of 7.775 grams, [14] and a diameter of 18.0 mm. [15] The coin was designed by Tiit Jϋrna and produced by the Mint of Finland with a quantity of 3,000 pieces.
The Platinum Eagle is authorized by the United States Congress, [4] and is backed by the United States Mint for weight, content, and purity. Its obverse was designed by John Mercanti , and portrays the Statue of Liberty ( Liberty Enlightening the World ) by Frédéric Auguste Bartholdi .
The Metre Convention was signed on 20 May 1875 and further formalised the metric system (a predecessor to the SI), quickly leading to the production of the IPK.The IPK is one of three cylinders made in London in 1879 by Johnson Matthey, which continued to manufacture nearly all of the national prototypes as needed until the new definition of the kilogram came into effect in 2019.
A piece of alloy metal containing a precious metal may also have the weight of its precious component referred to as its "fine weight". For example, 1 troy ounce of 18 karat gold (which is 750 ‰ gold) may be said to have a fine weight of 0.75 troy ounces. Most modern government-issued bullion coins specify their fine weight.
An average 70 kg human body is about 0.01% heavy metals (~7 g, equivalent to the weight of two dried peas, with iron at 4 g, zinc at 2.5 g, and lead at 0.12 g comprising the three main constituents), 2% light metals (~1.4 kg, the weight of a bottle of wine) and nearly 98% nonmetals (mostly water).
Country Name of bullion coin Fineness weights options in troy ounces (ozt) Years Minted Australia: Emu.9995: 1 ozt: 1995–1998 Canada: Palladium Maple Leaf.9995: 1 ozt: 2005–2010
The gold Vienna Philharmonic was first offered on October 10, 1989, and was initially minted in two sizes: one-ounce and one-quarter ounce. The one-tenth and one-half ounce coins were added in 1991 and 1994 respectively. All coins feature the same design with the only difference being the weight and face value shown.